Adjustable gauge



'Feb. 2 1926. r

J. R. AULENBACK ADJUSTABLE GAUGE Filed Feb. 13, 1925 zsneets-sheet 1WITNESS- Feb. 2,1926. 1,571,783

J. R. AULENBACK ADJUSTABLE GAUGE Filed Feb. 15. 1925 2 Sheets-Sheet '2Patented Feb. 2, 1926.

Q NITED STAT JAMES ROY AULENBACK, 0F WORCESTER, MASSACHUSETTS.

ADJUSTABLE GAUGE.

Application filed February 1 0 all fur/mm it may concern;

Be it known'that 1, Ja me ROY AULEN- men, a subject of the King of GreatBritain, residing at .lVorcester, in the county of lVorcester and Stateof Massachusetts, have invented new and useful Improvementsin AdjustableGauges,- of which the following is a specification.

This invention relates to adjustable gauges and its principal'object isto provide a gauge which can be readily and quickly adjusted to holes ofdifferent diameters to ascertain the diameterv of the hole.

A further object of the invention is to pro vide a device for measuringor ascertaining the diameter of openings which consist of a series oflongitudinally adjustable blades to engage the walls of the hole whichafter being adjusted to the walls of the hole will be positively lockedin such position so that an accurate reading will be had.

'The invention also'contemplates an ad justable tool which can bereadily set at a predetermined measurement to gauge finished tools andthereby ascertain whether or not the same are of the correctmeasurement.

lVith the preceding and other objects and advantages in view, theinvention consists in the novel combination of elements, arrangement ofparts and operations to be hereinafter specifically referred to,illustrated in the accompanying drawings and pointed out in the appendedclaims.

In the drawings:

Figure 1 is a side elevation of a gauge embodying my invention.

Figure 2 is a longitudinal sectional view of the same.

Figure 3 is a sectional View taken on line 3-3 of Figure 2.

Figure 4 is a sectional view taken on line tt of Figure 2.

Figure 5 is a perspective of one of the blades embodying the invention.

Figure 6 is an elevation of a modified embodiment of the invention.

Figure 7 is a longitudinal sectional view of the same.

Figure 8 is a perspective of one of the blades used in the modifiedembodiment of the invention.

Figure 9 is a sectional view taken on line 9-9 of Figure 7, and Figure10 is an end elevation of the device.

Referring to the drawing in detail, and particularly to Figures 1 to 5inclusive, the

13, 1925. Serial No. 9,001.

numeral 5 designates a shank having one end tapered from a pointintermediate its ends to its outer end and provided with a plurality ofgrooves 7 which diverge to the wider or outer end of the tapered part.This shank 5 is formed with a continuous bore which is of increaseddiameter from a point intermediate its ends to its inner end. This boreis designated generally at 10 and the wider end thereof is indicated at11. A longitudinally adjustable rod 12 extends through the bore and hasits inner end threaded as at 13 and engaged with a longitudinallymovable nut 14 which is received in the part 11 of the bore 10. Anexpansible coil spring 15 encircles the part 10 and has one endpositionedagainst the nut 14 and its other end bearing against theshoulder afforded by the forn'iation of the bore.

- A head 16 is formed upon the outer end of the rod 9 and has its innerend bevelled as at 17. Longitudinally movable in the groove 6 is aplurality of blades 18 having their inner faces inclined in the samedirection as the faces of the groove 6. The forward ends of these bladesare provided with notches, the inner walls of which are bevelled in thesame plane as the bevelled edge 17 on the head 16 so that the bevel face17 will interlock with the notches. The opposite ends of the blades arebevelled as at 19 and are engaged by the bevelled inner end of anadjusting sleeve 20 threaded on the threaded surface 21 of the shank 5.A thimble 22 is received on the threaded sleeve 20 and the shank 5 andis locked thereto by diametrically opposite pins 23 extending from thesleeve 20 and engaged in openings 24 in the thimble.

In the use of the invention disclosed in Figures 1 to 5, the thimble 22is rotated to move the sleeve 20 toward the outer end of the shank andthe contacting of the beveled end of the sleeve 20 with the beveled ends19 of the blades 18 will move the same longitudinally intheir grooves,until the outer edges of these shanks contact the walls of an openingwhose diameter is to be ascertained. With the device thus operating, thespring 15 normally moves the rod 10 in a direction causing the bevelledsurfaces 17 and 19 to interlock, which will hold the blades in theadjusted position.

In the form of the invention shown in Figures 6 to 10, the rod andspring are eliminated. In lieu of these parts, I employ a head having acentral opening it. A. locking plate 27 is positioned against this headand is formed with a screv. or threaded shank 28 which passes throughthis opening 26 and is received in an internally threaded bore providedin the shank 5. In this form of the inventiomthe blades are providedwith serrations or teeth 30 and the thimble 92 is provided withgraduations 31 to indicate the adjustment of the device.

In this embodiment of the invention, the device is used for the purposeof measuring tools which is to ascertain whether or not they are of thecorrect diameter whereas the device shown in Figures 1 to 5 is used toascertain the diameter of an openin lVhile I have shown and describedthe preferred embodiment of the invention, I desire to have itunderstood that such changes may be made in the form, construction andarrangement of parts, and operations as will not depart from the spiritof the invention or the scope of the subjoincd claims.

What is claimed is:

1. An adjustable gauge comprising a shank, having one end tapered from apoint intermediate its ends to its outer end and further provided withgrooves extending longitudinally of the shank and inclined to the axisthereof, a series of blades adjustable in the grooves and having notchesat their outer ends, adjusting elements threaded on the shank and havingone end bearing against the inner ends of the blades, a longitudinallymovable rod slidably carried by the shank, a head carried thereby andengaging the outer ends of the blades and an expansible coil springnormally urging the rod in a direction to cause the head to engage theblades.

2. A device of the character described comprising a hollow shank, afrusto conical member formed therewith and having a se ries of groovesextending longitudinally oi the shank and inclined to the axis thereof,a threaded sleeve on the shank, a series of blades adjustable in thegrooves and having notches in their outer ends, a head, a shank formedwith the head passing through the frusto conical member and hollow shankand capable of longitudinal movement there in, said head having inclinedsurfaces on its inner face and engaged in the notches, and an expansiblecoil spring encircling the shank, and a nut on the shank and received inthe hollow shank and with which one end of the coil spring engages.

In testimony whereof I aflix my signature.

JAMES R. AULENBACK.

